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2400D - Pneumatic Indicating Relay |
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Features● PINPOINTS TROUBLE ● FIELD PROVEN wide OPERATING PRESSURE RANGE ● SIMPLE MAINTENANCE ● ONE MOVING PART ● CORROSION RESISTANT GULFPROOFED FINISH Applications● PNEUMATIC CONTROL PANELS ● FIRST-OUT INDICATION ● SAFETY SEQUENCING SYSTEMS ● FAIL SAFE SYSTEMS OperationPINPOINTS TROUBLE and instantly provides easily visible trip indication. The first-out indication is held indefinitely. This simplifies trouble shooting to save time and reduce maintenance costs. FIELD PROVEN DURABILITY that has made this indicating relay the industry standard pneumatic panel relay for over thirty years. Originally developed to withstand the rigorous conditions experienced in diesel and gas engine operating environments, the 2400D has proven highly reliable in turbine pump and de-man ding process applications. WIDE OPERATING PRESSURE RANGE allows the 2400D to be used in pneumatic systems having circuit pressure of up to 125 psi. SIMPLE MAINTENANCE has been a key factor in the acceptance of the 2400D. The 2400D has only one moving part and all seals and O-rings on this sliding piston are easily accessible. GULFPROOFED (corrosion resistant) finish is standard for increased resistance to seacoast or other corrosive atmospheres. Usually one 2400 Relay is connected to each condition sensing device as shown in Figure 1. The sensing devices are normally closed 2 or 3 way valves which detect undesirable temperatures, pressures, vibration, liquid levels, etc. Sensing valves are connected to the TRIP Port in each relay, and pressure is introduced at the IN Port. If the particular parameter is in a "run" or satisfied condition, and the sensing valve is closed, pressure will feed through the internal orifice to the large end of the piston and force it into the "Green" or safe position. Pressure is also directed through to the OUT Port which is normally piped to the IN Port of the next relay. When a fault condition arises, the valve sensing that condition opens, causing a loss of pressure at the large end of the piston and allowing pressure on the small end to move the piston to the "Red" or tripped position. The OUT Port connects with the VENT Port through specially formed vent grooves and all pressure down stream is released to the VENT Port as the IN Port is closed off from the OUT Port. This loss of pressure can be used to close fuel valves, actuate audible alarm devices or operate remote signal devices or switches. Any indications existing at the moment will be held indefinitely. The unique Red and White "Trip" tape, selected by optical specialists, can be clearly seen at a distance even in poor light or by those with impaired color vision. An operator can check the 2400 Relay panel at any time and tell immediately what caused the trouble. When a 2400 Relay systems is reset, most relays will momentarily move the "Trip" position, then back to the "Green" as the lines to the sensing valves are pressurized. Only when sensor lines are very short will this not occur. This action will be quite pronounced in some systems and is an indication that the Relay is performing properly. If all sensing valves are healthy or satisfied on start-up, all relays will be "Green". Should a condition not be satisfied, its Relay will stay "Red". Most systems have certain functions that are unsatisfied on start-up. These functions are locked out by pneumatic time delays or other means to allow the rest of the system to function normally. In most cases, only one Relay will show "Red" on a shutdown in a properly designed system. However, if two or more malfunctions should occur within a split second of each other, both Relays may go "Red". A correct system will be designed so that an intentional or normal shutdown will leave the Relays all "Green". Type 2400D with spring return is suggested when a Relay and Pressure indicator is required, having an automatic return to "Red" on loss of pressure. It has a return spring and no orifice, thus the TRIP Port is isolated from the other ports. Then an indicator for pressure only is desired, AMOT Model 4101 should be ideal as it matches the panel-front appearance of the 2400D's. SpecificationsHousing and Piston Material...........................Aluminum |
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This and other information from AMOT provide product or system options for further investigation by users having technical expertise. Before you select or use any product or system, it is important that you analyze all aspects of your application and review the information concerning the product in the current product catalog. The user, through its own analysis and testing, is responsible for making the final selection of the system and components and assuring that all performance, safety and warning requirements of the applications are met.
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